class 10th science chapter 4 effect of electric current question answer |Exercise std 10 science ch4
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Science and Technology Part 1...
Exercise
1. Tell the odd one out. Give proper
explanation.
a. Fuse wire, bad conductor, rubber
gloves, generator.
b. Voltmeter, Ammeter, galvanometer,
thermometer.
c. Loud speaker, microphone, electric
motor, magnet.
2. Explain the construction and working
of the following. Draw a neat diagram
and label it.
a. Electric motor
b. Electric Generator(AC)
3. Electromagnetic induction means-
a. Charging of an electric conductor.
b. Production of magnetic field due to a
current flowing through a coil.
60
4.
5.
6.
7. Give Scientific reasons.
a. Tungsten metal is used to make a
solenoid type coil in an electric bulb.
b. In the electric equipme producing
heat e.g. iron, electric heater, boiler,
toaster etc. an alloy such as Nichrome
is used, not pure metals.
c. For electric power transmission, copper
or aluminium wire is used.
d. In practice the unit kWh is used for the
measurement of electrical energy,
rather than joule.
8. Which of the statement given below
correctly describes the magnetic field
near a long, straight current carrying
conductor?
a. The magnetic lines of force are in a
plane, perpendicular to the conductor
in the form of straight lines.
b. The magnetic lines of force are parallel
to the conductor on all the sides of
conductor.
c. The magnetic lines of force are
perpendicular to the conductor going
radially outward.
d. The magnetic lines of force are in
concentric circles with the wire as the
center, in a plane perpendicular to the
conductor.
9. What is a solenoid? Compare the
magnetic field produced by a solenoid
with the magnetic field of a bar
magnet. Draw neat figures and name
various components.
c. Generation of a current in a coil due
to relative motion between the coil
and the magnet.
d. Motion of the coil around the axle in
an electric motor.
Explain the difference :
AC generator and DC generator.
Which device is used to produce
electricity? Describe with a neat
diagram.
a. Electric motor
b. Galvanometer
c. Electric Generator (DC)
d. Voltmeter
How does the short circuit form?
What is its effect?
C.
12. Solve the following example.
a. Heat energy is being produced in a
resistance in a circuit at the rate of
100 W. The current of 3 A is flowing
in the circuit. What must be the
value of the resistance? (Ans: 1152)
b. Two tungsten bulbs of wattage
100 W and 60 W power work on
220 V potential difference. If they
are connected in parallel, how much
current will flow in the main con-
ductor?
(Ans: 0.72A)
c. Who will spend more electrical
energy? 500 W TV Set in 30 mins,
or 600 W heater in 20 mins?
(Ans: TV Set)
d. An electric iron of 1100 W is
operated for 2 hrs daily. What will
be the electrical consumption
expenses for that in the month of
April? (The electric company
charges Rs 5 per unit of energy).
(Ans: Rs 330)
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